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# A module for working with dgit(1) repositories
#
# Copyright (C) 2017 Sean Whitton
#
# Maintainer: Sean Whitton <spwhitton@spwhitton.name>
# DEFINITION
#
# A dgit repository is a git repository containing special remote refs
# of the form `remotes/dgit/dgit/*` and possibly also branches of the
# form `dgit/*`. See dgit(7) for more details.
#
# USAGE
#
# To make mr use this file, add a line like this inside the [DEFAULT]
# section of your ~/.mrconfig:
#
# include = cat /usr/share/mr/dgit
#
# With this module active,
#
# `mr update` will:
#
# (1) if the current branch is named `dgit/SUITE`, call `dgit pull`.
#
# (2) use `dgit fetch` to update all remotes/dgit/dgit/*` refs.
#
# `mr register` will add a post_checkout hook that calls `dgit fetch`.
#
# DESIGN
#
# A dgit repository may have been obtained with `dgit clone`, or `git
# clone` followed by `dgit fetch`. It is not possible for us to
# determine which of these methods was used after the fact.
#
# For this reason, we do not define dgit_register and dgit_test so as
# to generate .mrconfig lines like
#
# [foo]
# checkout = dgit clone foo
#
# because that would fail to fetch branches not published to
# dgit-repos, such as branches published to alioth.debian.org.
#
# Instead, we extend git_update and git_register to obtain updates
# from dgit-repos.
# We can't use git_update_append because mr's built-in default `git
# pull` will often fail on a `dgit/SUITE` branch. After a `dgit
# clone`, (i) `dgit/SUITE` has no upstream tracking branch, and (ii)
# the 'origin' remote might not exist on the remote end (it depends on
# whether the package has ever been uploaded with `dgit push`)
git_update =
current_branch="$(git rev-parse --abbrev-ref HEAD)"
if [ "$(echo $current_branch | cut -s -d/ -f1)" = "dgit" ]; then
# (1) above
dgit pull
else
# mr's built-in git_update
git pull "$@"
fi
# (2) above
for suite in $(git show-ref | grep refs/remotes/dgit/dgit | cut -d/ -f5 ); do
# skip if we just called `dgit pull` on this suite
if ! [ "$current_branch" = "dgit/$suite" ]; then
dgit fetch $suite
fi
done
git_register_append =
lines="cd '$MR_REPO'"
for suite in $(git show-ref | grep refs/remotes/dgit/dgit | cut -d/ -f5 ); do
echo "Registering dgit suite: $suite in $MR_CONFIG"
lines="$lines; dgit fetch $suite"
done
if ! [ "$lines" = "cd '$MR_REPO'" ]; then
mr -c "$MR_CONFIG" config "`pwd`" post_checkout="$lines"
fi
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